21651760

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{191}}^1$

素因数の和:326

約数の個数: 80

約数和(自身を含む): 54996480

約数和(自身を除く): 33344720

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 109, 130, 191, 208, 218, 260, 382, 436, 520, 545, 764, 872, 955, 1040, 1090, 1417, 1528, 1744, 1910, 2180, 2483, 2834, 3056, 3820, 4360, 4966, 5668, 7085, 7640, 8720, 9932, 11336, 12415, 14170, 15280, 19864, 20819, 22672, 24830, 28340, 39728, 41638, 49660, 56680, 83276, 99320, 104095, 113360, 166552, 198640, 208190, 270647, 333104, 416380, 541294, 832760, 1082588, 1353235, 1665520, 2165176, 2706470, 4330352, 5412940, 10825880, 21651760]

約数ペア:

[(1, 21651760), (2, 10825880), (4, 5412940), (5, 4330352), (8, 2706470), (10, 2165176), (13, 1665520), (16, 1353235), (20, 1082588), (26, 832760), (40, 541294), (52, 416380), (65, 333104), (80, 270647), (104, 208190), (109, 198640), (130, 166552), (191, 113360), (208, 104095), (218, 99320), (260, 83276), (382, 56680), (436, 49660), (520, 41638), (545, 39728), (764, 28340), (872, 24830), (955, 22672), (1040, 20819), (1090, 19864), (1417, 15280), (1528, 14170), (1744, 12415), (1910, 11336), (2180, 9932), (2483, 8720), (2834, 7640), (3056, 7085), (3820, 5668), (4360, 4966)]